Josef Frolík (September 22, 1928 – May 1989) was a Czechoslovak spy who, in 1969, defected to the United States and joined the CIA.
After the war he studied at the business academy in Slaný and worked as an accountant for the state-owned communist newspaper Rudé právo.
[1] Whilst serving his mandatory two years service in the Czechoslovak People's Army Frolík discovered that some officers of the 2nd Infantry Regiment had stolen a small fortune in jewels and paintings.
He moved on to counter intelligence and from 1964 to 1966 worked as a spy in London under the guise of a diplomat in the Czechoslovak embassy.
He was recalled back to Czechoslovakia and in 1969 he managed to gather as many state secrets as he could and escaped to the west, defecting to the CIA.